Concrete block molding machine



Feb. 9, 1942*.4 B. BREKKEF- Y CONCRETE BLOCK MOLDIIIIIG` MACHINE 2 Sheets-Sheet 1 Filed June 19, 1942 /'ek/re INVENTOR A TTORNEY 5 14n... .2. /Ml. 6/

Feb. 9, 1943. B. BREKKE CONCRETE BLOCK MOLDING MACHINE Filed June 19, 1942 2 Sheets-Sheet 2 fe/r/ie l ATTORNEY enjmin JNvNToR Patmed Feb. 9, 1943 UNITED. STATES PATENT Ormea f' 2,310,833 Y CONCRETE BLOCK MoLmNG MACHINE Benjamin Brekke, Longview, Wash. Application June 19, 1942, Serial No. 447,705

6 Claims.

This invention relates to molds and is particularly adapted for the molding of concrete building blocks.

. The primary object of the invention is to construct a mold having a retracting core therein for molding building blocks.

Another object of the invention is the providing of means within the core for supporting reinforcing bars to be molded within the concrete building blocks.

A further object of the invention is the provision of means within the retracting core for disengaging the core from the reinforcing bars when the core is retracted from the mold.

A still further object of the invention -is the provision of a base for holding the block upon, so that when the core is retracted and the walls of the mold are disengaged from the molded block by the operator, the block can be removed from the mold and left on the base until cured.

And another object of the invention is the provision of mechanical operating means for raising the core .within the mold and for holding the same in position until released after the blocks have been molded within the mold.

These and other objects will be apparent in the drawings, specification, and claims.

Referring to the drawings:

Figure 1 is a side elevation of my new and improved mold for molding building blocks and the like.

Figure 2 is a plan view of Figure 1, parts broken away for convenience of illustration.

Figure 3 is a fragmentary view of Figure 2, illustrating the mold in unfolded position for the removal of the block.

Figure 4 is a sectional view of the mold illustrating the block being molded therein.

Figure 5 is a longitudinal section of the molding box of the mold, taken on line 5 5, looking in the direction illustrated and parts broken away for convenience of illustration.

Figure 6 is a fragmentary sectional end View of the mold, taken on line 6-6 of Figure 2.

Figure 7 is a similar view illustrating the mold in open position and the core in retracted position.

Figure 8 is a perspective view of the mold core and cover plate, the parts being shown detached from one another.

Figure 9 is a perspective view of a completed building block which has been manufactured by my new and improved mold.

Figure 10 is a perspective view of the base used to mold the blocks on within the mold, shown removed from the mold.

In the drawings:

My new and improved building block mold device consists of a frame I, mounted upon supporting legs 2. The mold consists of a stationary upright wall 3, having an angle base 4 secured to the frame I by suitable holding means, as bolts 5. The opposite wall of the mold 6 is hingedly mounted to the frame I,l at 1. The end walls 8 and 9 are hingedly mounted tothe wall 3 at Il). A base plate II, preferably made of wood, provides a bottom for the mold resting cured to thek wall 6 and receives the hingedly mounted latch bars I6, the notch I1 of the bars I6 holding the side wall 6 in vertical position, while. at the same time holding the end Walls 8 and 9 against the end of the wall best shown in Figures 1, 2 and 3.

'Ihe core I4 consists of end walls 2| and 22, and side walls I3 and 20, and is mounted upon a vertical supporting pedestal in the following manner. The pedestal 23 is secured between the cross walls 24 of the core by spacers 25 and bolts 26. The pedestal 23 passes down through the guide 21 of the cross frame 28, and is pivotally connected to the lever 29 by the link 3l).

The lever 29 is xedly secured to the cross shaft 3| at 32. A lever 33 is xedly secured to the shaft 3l at 34 at its lower en'd, having its upper end engaging the stop 35 when in the position shown in Figure 1, holding the core I4 of the mold in molding position. A spring 36 may be used for balancing the lever mechanism and the core so that it requires but slight mechanical effort to raise the core. A foot pedal 3l, forming part of the lever 29, assists the operator in disengaging the core from the molded block when the lever 33 is disengaged from the stop.

I will now describe the method of holding the reinforcing bars within the core I4 for molding while the material is being molded into building blocks. The cross bars 38, see Figure 8, are lowered to the bottom of the slots 39, after which the slots are closed by cross plates 40, which are spaced between the walls I9 and 20 by the shoulders 4|. The reinforcing bars 42 are lowered within the slots 43, after which the plate 44 is lowered into position providing a closed top for the mold, and a support for the cross plates 45, closing the slots 43. This provides a tight core, all of the slots 39 and 43 and the top of the core being closed after the spacer bars are put in place. 'I'he space 46 is then lled with `material and after the material has set suiiciently, the plate 44 carrying the plates 45 is then removed in one operation from the slots 43, the plates 40 may then be removed from the slots 39. This will permit the core to be lowered away from the reinforcing bars 38 and 42.

In order to lower the core, the lever33 is disi.

engaged from the stop 35 and the pedestal 23 is lowered by the lever 39 to the position s hown in Figure 7. The side walls I9 and 2U tapers slightly inward at their upper end so that the core .I4 may bermore readily disengaged from the molded block. After the core has been lowered the latches I6 are disengaged from the latches l5, allowing the end walls V8 and 9 to be Vopened to theposition shown in Figures 3 and 7, also allowing the side wall .6 to be lowered. The ends `of the base plate Il, which extends over the frame of the machine may be vgrasped by the operator and the molded block then set aside. The machine is now ready for another molding operation.

The structure ,of the core, as shown, is one of the .primary objects of my invention, providing a molding unit that is easily manipulated by the operator. The V-shaped slots 41 on either end of the core engage the inwardly extending pins 4,8 on the end walls V8 and 9, providing an accurate guide for the core and due to the taper of the opening 41 will rmly hold the core from sidewise vibration, when in molding position.

I do not wish to be limited in the exact shape of this core, as dierent shaped designs may be obtained, as for instance the manufacturing of a corner block having an annular shaped core may be used within this machine, neither do I wish to be limited to the exact detail of construction as other mechanical equivalents may be .used still coming within the scope of the claims.

What is claimed is:

1. A concrete block molding machine, including a mold box, a core movable into and out of the mold box, said core including side walls and end walls and being open at the top and bottom, slots in the side walls to receive reinforcing members for the block, means for closing the slots above the reinforcing members. and means for closing the top of the core.

2. A concrete molding machine, comprising a demountable mold box, a removable bottom therefor, a core movable into and out of the mold box through the bottom to define material molding spaces on each side of the core, the core be ing formed with slots opening through the upper ends of the side walls of the core to receive reinforcing members for the material on each side of the core, strips for closing the slots, a remov- .able top for the mold to close the interior of the same against the material, said core moving means including a rod connected with the core between the side walls thereof.

3. A .concrete molding machine, including a demountable mold box having a removable bottom, a core movable through the bottom into and out of the mold box for defining material molding spaces on each side of the core, the core including side walls and end walls, the side walls being formed with slots opening through the upper edges of the side Walls to receive reinforcing strips for the molded material on each side of the core, removable closures for the slots, and a closure for the upper end of the core.

4. A construction as defined in claim 3, wherein the slots in the side walls of the core are of different `depths vertically of the core.

5. A construction as dened in claim 3, wherein certain of `the means for closing the slots is carried by the closure for the core.

6. A concrete block molding machine, comprising a .demountable mold box, a removable bottom, a retractable core, slots within the core body for holding reinforcing bars being molded within the block, plates for lling the slots and holding the spacer bars, said plates being removable permitting the slots of the core to disengage from the reinforcing bars when the core is retracted from the mold.

BENJAMIN BREKKE. 

